【正文】
F Window Checksum Urgent pointer Option + Padding Data 下 圖 是 科來(lái)網(wǎng) 絡(luò) 分析系 統(tǒng) 對(duì) TCP 協(xié)議進(jìn) 行解 碼視圖 : 我 們對(duì) 上 圖 中的 TCP字段 進(jìn) 行 詳細(xì)說(shuō) 明: 字段 說(shuō)明 數(shù)據(jù)包解碼詳解 成都科來(lái)軟件有限公司 電話: 02885120922 Email: 傳真: 02885120911 8 / 12 Source Port: 80 源端口, HTTP 為 80端口 Destination Port: 3406 目 標(biāo) 端口 Sequence Number: 4161759990 32 bits. The sequence number of the first data octet in this segment (except when SYN is present). If SYN is present, the sequence number is the initial sequence number (ISN) and the first data octet is ISN+1. Ack Number: 0 32 bits. If the ACK control bit is set, this field contains the value of the next sequence number which the sender of the segment is expecting to receive. Once a connection is established, this value is always sent. Data Offset: 80 Header Length: 80 4 bits. The number of 32bit words in the TCP header. This indicates where the data begins. The length of the TCP header is always a multiple of 32 bits. Reserved: 0 6 bits. Reserved for future use. Must be cleared to zero. Urgent pointer: Urgent pointer field significant. Acknowledgment number Acknowledgment field significant. Push Function: Push function. Reset the connection: Reset the connection. Synchronize sequence: Synchronize sequence numbers. End of data: No more data from sender. Window 16 bits. It specifies the size of the sender39。 以太網(wǎng) 值為 6。 Precedence 優(yōu)先路由信息 Delay 遲延 Throughput 吞吐量 Reliability 可靠性 Total Length: 131 總長(zhǎng) 131(單位字節(jié),最長(zhǎng)為 65535 字節(jié)) Identification: 10403 標(biāo)識(shí) Fragmentation Flags: 000. .... 標(biāo)志 Reserved: 保留 Fragment: 片斷 More Fragment: 最后片斷 Fragment Offset: 0 偏移量 Time to Live: TTL, 科來(lái)網(wǎng) 絡(luò)分析系統(tǒng) 將丟棄 TTL=0 的數(shù)據(jù)包 Protocol: 17 是哪種協(xié)議, 1–ICMP, 6 – TCP, 17 – UDP, 89 – OSPF Check Sum: 0xCE73 對(duì) IP 協(xié)議頭的校驗(yàn)合, 0xCE73 為正確 Source IP: 源 IP 地址 Destination IP: 目標(biāo) IP 地址 數(shù)據(jù)包解碼詳解 成都科來(lái)軟件有限公司 電話: 02885120922 Email: 傳真: 02885120911 5 / 12 ? ARP 協(xié)議結(jié)構(gòu) ARP 的 詳細(xì)資 料,可參 見(jiàn) 網(wǎng) 頁(yè) : 以下是 ARP 協(xié)議結(jié)構(gòu) : 8 16 32 bits Hardware Type Proto